Spark-plug.



H."L FLOOD.

SPARK PLUG.

APPLlCATlON man FEB. 20. 191?.

v Y IINVENTOR J 11L. 1' load.

ATTORNEY T 20 tical, simple and commercially desirable.

UNITED STATES PATENT OFFICE.

HENRY LEE Freon, or PONCA crrr, exi encies,

streak-PLUG.

Specification of Letters Patent Application filed February 20, 1917. seriai no. 149,862. e

To all whom it may concern:

Be it known. that I, HENRY LEE Fnoon, a citizen of the United States, residing at Ponca City, in the county of Kay and State of Oklahoma, have invented new and useful Improvements in Spark-Plugs, of which the following is a specification.

This invention comprehends i improvements. in spark plugs and has for one of its objects the provision of a spark plug having no cavities or recesses for the collection of carbon'or soot to cause a shorting of the circuit.

Another object of the invention is to provide a spark plug having a core or insulat-I ing material which does not have to be removed from its shell when the plug is cleaned.

The invention also aims to generally improve spark plugs to render them more prac- With these and other objects in view as will become more apparent as the descripclaimed.

In the drawings,

Figure 1 is a side elevation of the spark.

Fig. 2 is a longitudinal sectional view therethrough.

Fig. 3 is a section on the plane at right angles to the plane of Fig, 2, and

Fig. 4 is a top plan view of the spark" A connection with the accompanying drawplug.

Referring in detail to the drawings by numerals, 1 designates a metallic sleeve or shell internally threaded for its entire length and externally threaded adjacent its inner end as indicated at 2 to screw into the cylinder of an engine. The shell is enlarged at its upper end to form wrench engaging faces 3.

Extending through the sleeve'or shell 1 is an .insulating'core 4 of porcelain, mica or other suitable material and this core is formed on its inner end with a slightly enlarged head 5 having a shoulder 6 to squarely engage the inner end of the shell 1. The head may be.slightly rounded and I has a surface of regular contour which will terial.

is for the purpose of connecting a ratenteenor. 13-," 1917. f

outer portion of the core ed portion isofso h t and is externally threaded]adjacentiits end engage with the internally thread portion to ed cap 8.

The electrode 9 i extends laterally its; inner endto form a contact with the 'she1l;1

and the electrode 10' which extend'ssubstantially the entire length of the .core terminates at its outer end in a transverse recess 11 opening upon one side of the core. A sight opening 12 runs through the core at right angles to the recess 11 and intersects said recess.

The cap 8 carries an adjusting or intensifying screw 13 which extends into the recess to the electrode 10 to cause a spark which may be seen through the sight opening 12. A nut 14 screws on the binding post 15 and the spark plug.

When assembled the spark plug presents no cavities or recesses for the collectionof carbon and soot and the core does not have to be removed from the shell when the points of the plug are to be cleaned. The spark plug is leak proof and possesses no bushings, gaskets and the like to get out of order.

wire to Current will flow in through the cap 8, jump ings, it will be apparent that I have pro:

vided a very simple and practical spark plug which will not be liable to get out of order and which will not readily be shorted by accumulations of carbon and soot,

l/Vhile I- have shown and described the preferred embodiments of my invention it will be clearly understood that I do not wish to be limited to this construction, but may make such changes as will fall within the scope and spirit of the invention as claimed.

What I claim is :v

1. A spark plug comprising a metallic shell adapted to fit into an engine cylinder,

.an insulating core extending through said shell, a head on the inner end of the core engaging the end of the shell, electrodes carried by said core, one of said electrodes being grounded said core.

and acap on the outer end 61-- lie - 2. A spark plug comprising an internally threadedshell adapted for connection to an engine cylinder, acore extending through. said shell Land threaded for engagement 4 therewith, a headformed on the inner end of i said core, said head lying entirely withoutthe shell and engaging the inner end thereof, an,

' of the core and an intensifying screw extending through said transverse opening into close proximity with the second mentioned electrode, and means for the connection of a wire to said shell.

3. A spark, plug comprising a metallic shell internally'threaded', an insulating core extending through said shell and threaded for engagement therewith, a rounded head on the inner end of said core for e gagement with the inner end of the she and electrodes parried by the core, one of said electrodes'being grounded to the shell.

In testimony whereof I aflix my signature.

HENRY FLOOD. 

